When using /ride to ride a pig, you are unable to control the direction of the pig with a Carrot on a Stick item as the pig stares up to face the player riding. Right clicking consumes the durability of the item but the pig still does not move.

This behaviour is not the same with Striders as they behave the same as when they have a saddle.

Steps to Reproduce:
1) /summon pig
2) /ride @s mount ?
where ? is the UUID of the pig which can be found by shift clicking the "Summoned new Pig" text in chat
3) Hold out a Carrot on a Stick item and notice that the pig does not move, looking up.
4) Right click the Carrot on a Stick and notice that the durability decreases but no movement happens